With the rest of the rotation dealt away, it's left to Clay Buchholz to step up and anchor the staff.

BOSTON - The lineup on Saturday featured some changes for the Red Sox.

Yoenis Cespedes made his Red Sox debut, but did so playing left field rather than right. He singled on a 3-and-2 pitch in his first at-bat and rode home on Mike Napoli's home run in the second inning.

After the trade which brought him here from Oakland, the Red Sox spoke of their desire to have to Cespedes play right. But after he arrived late Friday afternoon, he didn't have any time to take fly balls there and the Sox don't want him to get thrown into a position as demanding as right field in Fenway without first getting some pre-game work there.

"Our goal,'' said John Farrell, "is to get him to be our everyday right fielder, but out of fairness to Yoenis, we need to get him some early work there, particularly at Fenway.''

Cespedes was in left, but Allen Craig, who played left Friday in his Red Sox debut, was out of the lineup, nursing a turned ankle.

"The plan was for [Daniel] Nava to be in the lineup today, regardless," said Farrell. "But this will give a day or so to address some of that.''

Nava was in right.

***From a distance, Farrell has marveled at the raw power of Cespedes, who has won the last two Home Run Derbies at the All-Star Game.

"It as much raw power as you can find in the game,'' said Farrell. "We've seen it in-game rather than in an exhibition derby-type thing and we're looking forward to seeing him on the field. His middle-of-the-order presence is what we've needed to lengthen out our lineup and he provides that.''

Still, Cespedes, for all his power, hasn't hit more than 23 homers in a season.

"For me to comment on that, I think it would be unfair, for the handful of at-bats I've seen from across the field,'' said Farrell. "Getting to see him every day, we'll get a better read on that. I would think some of the balls that he mis-hit in Oakland would have a chance to be otherwise here.

"So, we're looking forward to seeing his career with the Red Sox begin today.''

***The Sox have announced their rotation for St. Louis, with Rubby De La Rosa Tuesday, Joe Kelly against his former team Wednesday and Brandon Workman on Thursday.

Kelly arrived Saturday and was activated, with Anthony Ranaudo being sent back to Pawtucket.

"I've gone from one great baseball town to another,'' said Kelly. "These guys traded for me and I'm looking forward to the opportunity to help this team win and every single time I'm on the mound, pitch my butt off.''

Kelly said he learned of the trade on Twitter while the Cardinals were in San Diego. He was in the trainer's room with former Red Sox catcher A.J. Pierzynski and saw speculation that John Lackey was coming to St. Louis.

"Fifteen minutes later, Lackey was traded,'' said Kelly. "The other two players weren't named yet and I kept looking and looking, saying, 'I wonder who it could be.' Then I saw it pop up - '[Allen] Craig and Kelly for Lackey.' Then I got a phone call from my agent and saw it on MLB Network.''

Facing his former team Wednesday "is definitely going to be a little weird, but it's just another ballgame,'' said Kelly. "I'll be 100 percent locked in. I'll just try to make pitches and get those guys out.''

Sean McAdam serves as Comcast SportsNet's MLB Insider. Read more from Sean here, or follow him on Twitter or Facebook.